from django.shortcuts import render, get_object_or_404
from .models import Question, Choice

# Create your views here.
from django.http import HttpResponse, HttpResponseRedirect
from django.urls import reverse
from django.views import generic
from .forms import *

class IndexView(generic.ListView):
    template_name='myapp/index.html'
    context_object_name='latest_question_list'

    def get_queryset(self):
        ''' return the last five published questions. '''
        return Question.objects.order_by('-pub_date')[:5]

class DetailView(generic.DetailView):
    model = Question
    template_name= 'myapp/detail.html'

class ResultsView(generic.DetailView):
    model = Question
    template_name = 'myapp/results.html'

def default_form_view(request):
    form = LoginForm();
    context={"form":form}
    return render(request,"myapp/form.html",context)

def index(request):
    latest_question_list = Question.objects.order_by('-pub_date')[:5]
    loginform = LoginForm()

    context = {'latest_question_list':latest_question_list,
     'loginform':loginform}
    return render(request,"myapp/index.html",context)

def detail(request, question_id):
    regform = RegisterForm()
    question = get_object_or_404(Question, pk=question_id)
    context = {'question':question, "form":regform}
    return render(request,'myapp/detail.html',context)

def results(request,question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request,'myapp/results.html',{'question':question})

def vote(request,question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
    # Redisplay the question voting form.
        return render(request, 'myapp/detail.html', {
        'question': question,
        'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        # Always return an HttpResponseRedirect after successfully dealing
        # with POST data. This prevents data from being posted twice if a
        # user hits the Back button.
        return HttpResponseRedirect(reverse('myapp:results', args=(question.id,)))
